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NET INCOME PER SHARE (Antidilutive Securities Excluded from Computation of Earnings Per Share) (Details) (Options, nonvested shares and warrants [Member])
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Options, nonvested shares and warrants [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Number of potential anti-dilutive shares outstanding 97,392,523us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= kz_OptionsNonvestedSharesAndWarrantMember
11,320,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= kz_OptionsNonvestedSharesAndWarrantMember
285,312,520us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= kz_OptionsNonvestedSharesAndWarrantMember